It is possible for 25-year-olds to develop bowel cancer, and the possible risk factors for bowel cancer are as follows: 1) Long-term high-fat and low-fiber diet. 2) Poor defecation habits, such as prolonged squatting to defecate, reading books, newspapers and cell phones while defecating, or smoking and excessive straining to defecate. 3) Chronic inflammation of the intestinal tract. 4) Genetic factors. For people with the above bad dietary habits and defecation habits, or people with familial intestinal polyps and intestinal cancer, if there is an unexplained abdominal swelling, blood in the stool, pus and blood stools, or recurrent intractable diarrhea, accompanied by lethargy, low-grade fever symptoms, you need to pay close attention to it. In this case, it is better to do fiber colonoscopy to rule out the possibility of intestinal cancer.